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Old 14-10-2018, 08:49   #16
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Re: Cooling LFP batteries

There is circuitry designed into lithium batteries to disconnect with excessive heat and over/under voltage. Check the manufactures website.
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Old 14-10-2018, 09:59   #17
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Re: Cooling LFP batteries

If your pack is DIY from bare cells, you are the one needs to put those controls in place.

Many BMS do not include any over / under temp controls.

And when they do they just isolate, disconnect, not actually do anything to keep things going.

Of course EV / automotive systems are more sophisticated, but pulling the pack out of the vehicle does not bring any of those goodies along.
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Old 14-10-2018, 12:31   #18
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Re: Cooling LFP batteries

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Originally Posted by john61ct View Post
If your pack is DIY from bare cells, you are the one needs to put those controls in place.

Many BMS do not include any over / under temp controls.

And when they do they just isolate, disconnect, not actually do anything to keep things going.

Of course EV / automotive systems are more sophisticated, but pulling the pack out of the vehicle does not bring any of those goodies along.
No one is DIT'ing their 12/24V battery systems. Check all the lithium battery manufactures. Circuitry is built into every battery. You don't want a lithium battery exploding.
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Old 14-10-2018, 12:39   #19
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Re: Cooling LFP batteries

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No one is DIT'ing their 12/24V battery systems. Check all the lithium battery manufactures. Circuitry is built into every battery. You don't want a lithium battery exploding.
really please show me where my bare prismatic cells have any circuitry built into them.
And yes I am a DIY'er on my boats Lfp bank.
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Old 14-10-2018, 12:50   #20
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Re: Cooling LFP batteries

OMG. Well then you are quite unique.
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Old 14-10-2018, 13:14   #21
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Re: Cooling LFP batteries

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OMG. Well then you are quite unique.
Gary.. Welcome to Cruisers Forum...

First I will direct you to the search function up in the right. If you just search LiFePO4 you will find 100s of threads on LiFePO4, many DIY.

I will then direct you to Google. A quick 1 min search of google will prove your statement not only wrong, but laughable.

There are 1000s and 1000s of users that are DIYing their own battery packs. There are even 1000s of user that are DIYing their own BMS.

However, I think you know that and that is not the point of your last 3 posts.
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Old 14-10-2018, 15:22   #22
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Re: Cooling LFP batteries

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No one is DIT'ing their 12/24V battery systems. Check all the lithium battery manufactures. Circuitry is built into every battery. You don't want a lithium battery exploding.
Lithium is an umbrella term, covers dozens of chemistries.

LFP specifically is the only one we recommend for House use, near zero fire risk just as safe as lead.

And you are only talking about packaged systems, either sub-par or very very pricey.

MOST LFP users here are DIY based on bare cells without any "circuitry" inside.

And finally your "just follow vendor specs" is a very controversial statement here.

I suggest you spend some time educating yourself, start by just reading past threads for a while before posting much.

This thread is long but informativeLiFePO4 Batteries: Discussion Thread for Those Using Them as House Banks

, make sure to give both Maine Sail and Ocean Planet your close attention.

Also MS' summary notes here
https://marinehowto.com/lifepo4-batteries-on-boats/

**Everything** at that site is worth reading
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